<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
   <style>
       #div1{
           width: 200px;
           height: 200px;
           background-color: red;
       }
   
   </style>
</head>

<body>
    <div id="div1">div </div>

   
    
</body>
</html>